GPS Determination of Groundwater Withdrawal Subsidence
Publication: Journal of Surveying Engineering
Volume 115, Issue 2
Abstract
Global Positioning System (GPS) surveys were undertaken in 1984 and repeated in 1985 along level lines in southeastern Arizona where subsidence induced by groundwater withdrawal was occurring. The objective of these surveys was to determine the accuracy with which subsidence could be determined both from comparison of repeat GPS measurements and from comparison of GPS measurements with existing leveling. Repeatability of GPS determinations of differential ellipsoid height during a single survey was at the 1–2‐cm level. Differencing results of repeat GPS surveys performed 15 months apart gave subsidence values that agreed at the 2–4‐cm level with those obtained from leveling. Also, it was found that, after using gravimetric geoid heights to convert GPS‐derived ellipsoid heights to orthometric heights, agreement between the GPS/geoid orthofnetric heights and leveling orthometric heights was in the 3–7‐cm range. These results show that repeated GPS measurements can be used to monitor future subsidence in southeastern Arizona and that comparison of GPS results with existing leveling can give valuable information on past subsidence in the area.
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References
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Fury, R. J. (1984). “Prediction of deflections of the vertical by gravimetric methods.” NOAA Technical Report NOS NGS 28. National Geodetic Information Center, NOAA, Rockville, Md.
2.
Remondi, R. W. (1984). “Using the Global Positioning system (GPS) phase observable for relative geodesy: modeling, processing, and results,” thesis presented to the University of Texas, at Austin, Tex., in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
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Strange, W. E. (1985). “High‐precision, three‐dimensional differential positioning using GPS.” Proc. First Int. Symp. on Precise Positioning with the Global Positioning System, 543–548.
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Strange, W. E. and Fury (1977). “Computation of deflections of the vertical in support of the readjustment of the North American Datum.” Proc. Int. Symp. On Optimization of Design and Computation of Control Networks.
Information & Authors
Information
Published In
Journal of Surveying Engineering
Volume 115 • Issue 2 • May 1989
Pages: 198 - 206
Copyright
Copyright © 1989 ASCE.
History
Published online: May 1, 1989
Published in print: May 1989
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